The AKB-320 has it all, optical trackball, scroll wheels, Windows key, multimedia control keys and Internet hot keys all are built in, this means it is the most efficient and productive personal keyboard you will use. The Adesso Multimedia Keyboard with Optical Trackball has features that will bring you to the web with a touch of the button. It lets you operate you multimedia software with easy access to the control keys. Its lightweight and stylish keyboard offers mobility and comfort wherever you type.Additional Information: Adesso Multimedia Keyboard and Optical Trackball AKB-320PB - keyboard , trackballDevice Type: KeyboardDimensions (WxDxH): 16.7 in x 5.9 in x 1.2 inWeight: 1.6 lbsConnectivity Technology: Wired - PS/2Keys Qty: 103Key/Button Function: Internet browsing, multimedia, My ComputerPointing Device / Manipulator: TrackballOS Required: Microsoft Windows 98SE/2000/ME/XP, Microsoft Windows Vista